arm64: dts: qcom: sm8550: add IPA information

Add IPA-related nodes and definitions to "sm8550.dtsi", which uses
IPA v5.5.

Signed-off-by: Alex Elder <elder@linaro.org>
Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8550-QRD
Link: https://lore.kernel.org/r/20231124181718.915208-2-elder@linaro.org


Signed-off-by: Bjorn Andersson <andersson@kernel.org>